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" Prone Plank: Get into a full push-up position with your palms on the floor beneath your shoulders. Hold here for 30 seconds with your abs contracted, and your arms and legs extended, and your head aligned with your spine. As you build strength, hold this position longer -- up to 1 minute. The Prone Plank targets your abs and chest. For a bigger challenge, try it with your forearms on the floor."
The Plank Twist exercise targets your abs, obliques, back, shoulders and arms while working your hamstrings. Do 8 reps. Plank Twist, 1 set of 8 reps.
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The plank twist and push-up exercise targets shoulders, back, arms, chest and abs. Do 3 sets of 8 reps.
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The Swivel Plank exercise works your abs and obliques.
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